Principle of polarizer

  The polarizer was invented in 1938 by Edwin H. Land of Polaroid Company of the United States. It is an optical element that converts natural light that is generally not polarized into polarized light.

Pieces. All liquid crystal panels have two polarizing plates, one of which is a polarizer and the other is an analyzer. The polarizer acts as an optical switch, and the liquid crystal display must rely on polarized light to be imaged.

The backlight module is responsible for providing the most basic light source for liquid crystal display, but the direction of the light sent out is inconsistent and radial. If such light passes through the twist of the liquid crystal molecules, we may see a white piece on the screen. , or a colorful block of color.

The lower polarizer takes over the work of normalizing the direction of the light to the liquid crystal layer. The liquid crystal molecules are twisted under the control of the TFT, and the light of the same direction is controlled to be bright, so that the brightness of the light to the rear pixel unit is changed. The liquid crystal itself has no color, so the color filter is used to produce various colors.

The original direction of the uniform light has become inconsistent after the twist of the liquid crystal layer, so if the diffused light is not re-formed, the light that is seen by the liquid crystal is still seen in front of the screen. It is not reflected, so the diffused light must be regularized here, using one and the next

The polarization direction of the polarizer is orthogonal to the optical axis that is twisted by the liquid crystal. The light of different angles passes through the brightness of the upper polarizer, so we can see the alternating light and dark picture on the screen, because the deflected light is After the color light of the color filter, we can see the image we need in front of the screen.